detect: implement http_accept_enc sticky buffer

Inspects Accept-Encoding header.

src/Makefile.am

@@ -164,6 +164,7 @@ detect-geoip.c detect-geoip.h \
 detect-gid.c detect-gid.h \
 detect-hostbits.c detect-hostbits.h \
 detect-http-accept.c detect-http-accept.h \
+detect-http-accept-enc.c detect-http-accept-enc.h \
 detect-http-accept-lang.c detect-http-accept-lang.h \
 detect-http-client-body.c detect-http-client-body.h \
 detect-http-connection.c detect-http-connection.h \

src/detect-http-accept-enc.c

@@ -0,0 +1,46 @@
+/* Copyright (C) 2007-2017 Open Information Security Foundation
+ *
+ * You can copy, redistribute or modify this Program under the terms of
+ * the GNU General Public License version 2 as published by the Free
+ * Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/**
+ * \ingroup httplayer
+ *
+ * @{
+ */
+
+
+/**
+ * \file
+ *
+ * \author Victor Julien <victor@inliniac.net>
+ *
+ * Implements http_accept_enc sticky buffer
+ */
+
+#define KEYWORD_NAME "http_accept_enc"
+#define KEYWORD_DOC "http-keywords#http-accept-enc"
+#define BUFFER_NAME "http_accept_enc"
+#define BUFFER_DESC "http accept encoding header"
+#define HEADER_NAME "Accept-Encoding"
+#define KEYWORD_ID DETECT_AL_HTTP_HEADER_ACCEPT_ENC
+#define KEYWORD_TOSERVER 1
+
+#include "detect-http-headers-stub.h"
+
+void RegisterHttpHeadersAcceptEnc(void)
+{
+    DetectHttpHeadersRegisterStub();
+}

src/detect-http-accept-enc.h

@@ -0,0 +1,23 @@
+/* Copyright (C) 2007-2017 Open Information Security Foundation
+ *
+ * You can copy, redistribute or modify this Program under the terms of
+ * the GNU General Public License version 2 as published by the Free
+ * Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef __DETECT_HTTP_ACCEPT_LEN_H__
+#define __DETECT_HTTP_ACCEPT_LEN_H__
+
+void RegisterHttpHeadersAcceptEnc(void);
+
+#endif /* __DETECT_HTTP_ACCEPT_LEN_H__ */

src/detect-http-headers.c

@@ -16,6 +16,7 @@
  */
 
 #include "detect-http-accept.h"
+#include "detect-http-accept-enc.h"
 #include "detect-http-accept-lang.h"
 #include "detect-http-connection.h"
 #include "detect-http-referer.h"
@@ -23,6 +24,7 @@
 void DetectHttpHeadersRegister(void)
 {
     RegisterHttpHeadersAccept();
+    RegisterHttpHeadersAcceptEnc();
     RegisterHttpHeadersAcceptLang();
     RegisterHttpHeadersReferer();
     RegisterHttpHeadersConnection();

src/detect.h

@@ -1243,6 +1243,7 @@ enum {
     DETECT_AL_HTTP_HEADER_NAMES,
     DETECT_AL_HTTP_HEADER_ACCEPT,
     DETECT_AL_HTTP_HEADER_ACCEPT_LANG,
+    DETECT_AL_HTTP_HEADER_ACCEPT_ENC,
     DETECT_AL_HTTP_HEADER_CONNECTION,
     DETECT_AL_HTTP_HEADER_REFERER,
     DETECT_AL_HTTP_RAW_HEADER,